| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.hadoop.hdfs; |
| |
| import java.io.IOException; |
| import java.util.NoSuchElementException; |
| |
| import org.apache.hadoop.hdfs.protocol.CorruptFileBlocks; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.fs.RemoteIterator; |
| |
| /** |
| * Provides an iterator interface for listCorruptFileBlocks. |
| * This class is used by DistributedFileSystem and Hdfs. |
| */ |
| public class CorruptFileBlockIterator implements RemoteIterator<Path> { |
| private final DFSClient dfs; |
| private String path; |
| |
| private String[] files = null; |
| private int fileIdx = 0; |
| private String cookie = null; |
| private Path nextPath = null; |
| |
| private int callsMade = 0; |
| |
| public CorruptFileBlockIterator(DFSClient dfs, Path path) throws IOException { |
| this.dfs = dfs; |
| this.path = path2String(path); |
| loadNext(); |
| } |
| |
| /** |
| * @return the number of calls made to the DFSClient. |
| * This is for debugging and testing purposes. |
| */ |
| public int getCallsMade() { |
| return callsMade; |
| } |
| |
| private String path2String(Path path) { |
| return path.toUri().getPath(); |
| } |
| |
| private Path string2Path(String string) { |
| return new Path(string); |
| } |
| |
| private void loadNext() throws IOException { |
| if (files == null || fileIdx >= files.length) { |
| CorruptFileBlocks cfb = dfs.listCorruptFileBlocks(path, cookie); |
| files = cfb.getFiles(); |
| cookie = cfb.getCookie(); |
| fileIdx = 0; |
| callsMade++; |
| } |
| |
| if (fileIdx >= files.length) { |
| // received an empty response |
| // there are no more corrupt file blocks |
| nextPath = null; |
| } else { |
| nextPath = string2Path(files[fileIdx]); |
| fileIdx++; |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public boolean hasNext() { |
| return nextPath != null; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public Path next() throws IOException { |
| if (!hasNext()) { |
| throw new NoSuchElementException("No more corrupt file blocks"); |
| } |
| |
| Path result = nextPath; |
| loadNext(); |
| |
| return result; |
| } |
| } |